Metabolism at 35: What Really Moves the Needle.

A 35-year-old journalist explores why metabolism slows with age, learning from experts that hormonal changes (like testosterone decline), stress, and sleep disrupt metabolic rate. The takeaway is practical: bias toward smarter, goal‑oriented routines—higher protein intake, resistance training to build muscle, adequate calories, and stress/sleep management—to maintain strength and leaness as you age.